I'm not a big person (6ft and 170 lbs) and I could fit easily thru a door with the opening that is 17 x 11 inches. As for a 16 inch pizza, I'm a rookie and so far have been sitcking to pizzas around 12 inches. The opening on my WFO is 24" but it is a true half circle and so the useable dimensions that one has to enter and work are probably pretty close to (if not smaller) than the door of which you speak. And I fit inside my WFO...see photo.

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